The PDP–11 supports hardware interrupts at four priority levels. Interrupts are serviced by software service routines, which could specify whether they themselves could be interrupted (achieving interrupt nesting).

citation

Wikipedia contributors. (2025, January 14). PDP-11. In Wikipedia, The Free Encyclopedia. Retrieved 17:59, February 28, 2025, from https://en.wikipedia.org/w/index.php?title=PDP-11&oldid=1269362335

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PDP-11 (Wikipedia) The PDP–11 is a series of 16-bit minicomputers originally sold by Digital Equipment Corporation (DEC) from 1970 into the late 1990s, one of a set of products in the Programmed Data Processor (PDP) series. In total, around 600,000 PDP-11s of all models were sold, making it one of DEC’s most successful product lines. The PDP-11 is considered by some experts to be the most popular minicomputer.